Move DevTools out of ash and turn it to a component.

ash/devtools/ash_devtools_css_agent.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ASH_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_
-#define ASH_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_
-
-#include "ash/ash_export.h"
-#include "ash/devtools/ash_devtools_dom_agent.h"
-#include "base/macros.h"
-#include "components/ui_devtools/CSS.h"
-
-namespace ash {
-namespace devtools {
-
-class ASH_EXPORT AshDevToolsCSSAgent
-    : public NON_EXPORTED_BASE(ui::devtools::UiDevToolsBaseAgent<
-                               ui::devtools::protocol::CSS::Metainfo>),
-      public AshDevToolsDOMAgentObserver {
- public:
-  explicit AshDevToolsCSSAgent(AshDevToolsDOMAgent* dom_agent);
-  ~AshDevToolsCSSAgent() override;
-
-  // CSS::Backend:
-  ui::devtools::protocol::Response enable() override;
-  ui::devtools::protocol::Response disable() override;
-  ui::devtools::protocol::Response getMatchedStylesForNode(
-      int node_id,
-      ui::devtools::protocol::Maybe<ui::devtools::protocol::CSS::CSSStyle>*
-          inline_style) override;
-  ui::devtools::protocol::Response setStyleTexts(
-      std::unique_ptr<ui::devtools::protocol::Array<
-          ui::devtools::protocol::CSS::StyleDeclarationEdit>> edits,
-      std::unique_ptr<
-          ui::devtools::protocol::Array<ui::devtools::protocol::CSS::CSSStyle>>*
-          result) override;
-
-  // AshDevToolsDOMAgentObserver:
-  void OnNodeBoundsChanged(int node_id) override;
-
- private:
-  std::unique_ptr<ui::devtools::protocol::CSS::CSSStyle> GetStylesForNode(
-      int node_id);
-  void InvalidateStyleSheet(int node_id);
-  bool GetPropertiesForNodeId(int node_id, gfx::Rect* bounds, bool* visible);
-  bool SetPropertiesForNodeId(int node_id,
-                              const gfx::Rect& bounds,
-                              bool visible);
-  AshDevToolsDOMAgent* dom_agent_;
-
-  DISALLOW_COPY_AND_ASSIGN(AshDevToolsCSSAgent);
-};
-
-}  // namespace devtools
-}  // namespace ash
-
-#endif  // ASH_DEVTOOLS_ASH_DEVTOOLS_CSS_AGENT_H_